Readily-soluble tanning agent



FRANZ' HASSLER, F HAMBURG, GERMANY, ASSIGNOR 1'0 ADOLF newness, on

NEW YORK, N. Y.

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No Drawing.

0 all whom it may concern: .Be it-known that I, FRANZ HAssnEn, citizen, of the State of Hamburg, residing at Hamburg-Volksdorf, Germany, have invent- 5 ed new and useful Improvements n Readily- Soluble-Tanning Agents, for WlllCh I have filed applications in Germany, H. 64,719, December 19th, 1913; France, 92,769, July 7th, 1917; Czecho-Slovakia, 18,234, April 1st, 1920; Austria, April 14th, 1920; Sweden, 1,60220, April 16th,1920; Hungary, April 17th, 1920; Holland, 14,625, Apiril 23rd, 1920; Norway, 19,995, Aprll 26th, 1920; Denmark, 1,15720, April 28th, 1920; Belgium, 229,334, May 4th, 1920;, Spain, May

. th, 1920, of which the following is a specification.

As is Well known, many natural tanning materials are difiicultly or incompletely soluble in cold Water, thus making the work of the tanner difficult and diminishing the efiiciency of the tanning extracts. Accordlng to the specification of Letters Patent 1,133,108 such tanning materials can be rendered more soluble by a treatment wlth soluble phenol condensation products containing at least one salt forming group. In .lieu of 'these condensation products, the specification of Letters Patent 1,216,612 makes, for

30 the same purpose, use of certain aromatic sulfonic acids of an amorphous character,

especially of those obtained from naphthalene, formaldehyde and sulfuric acid.

It has now been found that the dlfiicultly readily soluble even in cold water by adding 7 to them sulfonic acids of the higher, at least tricyclic, aromatic hydrocarbons (including Specification of Letters Patent.

soluble parts of tanning materials become carbazol) such as are found in the less volatile fractions of coal tar. It is only necessary to add the aforesaid materials, or salts thereof, to the tanning extracts or the tanning juices, while hot or cold. The resulting products are readily soluble in water even in a dilute condition. The process is further illustrated by the following example, to which, however, the invention is not confined.

Ewample.

100 parts by weight of quebracho extract of about 25 B. are mixed with 15 parts by weight of a sodium salt of a sulfonic acid of anthracene, phenanthrene, carbazol, or of mixtures, or of raw products thereof. The mass will quickly get thin and readily soluble in water. The same result as with quebracho extract is produced with other tanning extracts," such as mangrove.

1. As a new article of manufacture, read ily soluble tanning extracts, comprising a natural tan and a sulfonic acid of an at least tricyclic hydrocarbon.

2. As a new article of'manufacture, readily soluble tanning extracts comprising a natural tan, an at least tricyclic hydrocarbon.

3. As a new article of manufacture, readily soluble tanning extracts comprising a Patented Sept. e, mail; Application filed Jul 9, 1920. Serial No. 395,125.

and a salt of a sulfonic acid of natural tan, and a sulfonation product of FRANZ HASSLER. 

